Speed-governing device



I E. F. BROWN SPEED GOVERNING DEVICE Filed Nov.- 24. 1925 Patented Apr. 5, 1927.

Umr nisTArEs PATENT OFFICE.

EDGAR *1. BROWN, F. SALISBURY, MARYLAND.

SPEED-GOVERNING DEVICE.

drnli a iou vfiled:Iiwveinber a4, 1925, [Serial no. 71,143.

This invention relates to improvements in a mechanism for automatically [controlling the [speed of an internal combustion engine.

-A n objectoffthe invention resides in providing-adevice for Igoverning the speed of an internal combustion engine including a pai-nof disk members interposed inthe driving connection between the internal combusion engine and ill d i en haft, adapted for "relative v m o'vemer t, together with mean for ma n ai ing the disks n a .predetermined relation when no load is applied to the driven Shaft while the application of a loam the-tlriven-shaft rotates the disks relative to one another in a predetermined amonnt, which relative movement is em ployed for operating a thrott 1e control-niech- I anism inorder to prevent the motor from racing :under {no load conditions and for opening the throttle, to permit "the opera-- tion of the engine at a predetermined maximum speed whena load is applied to the shaft. I further object of the invention s to provide a pair of disk members adapted for relative movement of a predetermined characts;- which are normally retained in one limit position by] spring operated wedge mechanism'under no load condition and i which are moved to another. predetermined position'when the load is applied to "the driven shaft, overcoming the action of the spring, the motion of the wedge mechanism being utilized for the purpose of controlling'the speed 'of the motor through the throttle to prevent racingof themo'tor under'no load conditions, The invention comprehends numerous other objects residing'in thedetails of construetion and association of the parts of the apparatus which are more particularly pointed out inthe following detailed description and claim. directed to a preferred form of the invention, it being understood however, ,that vlarious changes may "be made in theQsiZe, shape and relation of the parts without departing from thespirit and scope of the invention. as herein-set forth. In the drawing formingpart of this ap plication:

Figure lis .a side elevation shoivingportionsin sectionfof the improved coupling andlcontrol device applied between an internal combustion engine and a generator.

Fig. 2 is a detail sectional view taken on the line'22 of Fig. 1.

Fig. 3 is a view similar to Fig. 2 showing the disks in the opposite limits of movement from that shown in Fig. 2. i

Fig. 4 is a sectional view takenon line 4-4 of Fig. 1.

An internal combustion engine of any converitional fo m s ndic ted a 1, having the ankshaf 2, While a e ec ric'generator i i in a ed a nd a driven shaft 4 f rm:- ing the armature shaft of the generator.

The present invention designed for use more particularly with internalcombus I t'ion driven generator structure generallyused as part of portable arc welding units,

and provides a coupling device between th'e .motor and generator as well as flan auto matic control for the speed of themotor.

This invention includes an annular ,driv

ing disk 5, a hub portion 6 secured to the crank shaft of the motor to Whichis secured a driven disk? having a hub .portionS mounted on. the driven shaft 4. A driving connection between the driving and driven disks and 7 respectively is formed by the bolt connections 9 at diametrically opposite point adjacent the periphery of Said disk and the driven disk is formed with slotted openings receiving said bolts '9 in order to permit ,a relative rotative movement of the driven disk with respect to l he driving disk.

At intermediate diametrically opposed. points from bolts 9, the driven disk .7 is

formed with a pair of :arcuatc slots Il -in which are mounted stud bolts 12 rigidly secured and mounted on the driving disk 5.

The end portions of these stud bolts 12 within the slots 11 are formed with beveled faces 13 as clearly shown in Figs. 2 and 3 'wi'th which engage the beveled faces 1410f; the rod members 15 mounted in the arms. 16 formed on the annular body member 17 Wa d the driving and driven disks :5 7 respectively. I I

The cylindrical body 17 is formed with an annular channel 21 in which is positioned the forked end 22 of the control lever 23 pivotally mounted in the bracket 24 secured to the body of the generator 3, while the free end is connected by a rod 25 to the throttle lever 26 of the motor.

In operating a motor generator set of this character, in an arc welding set, the motor under load is usually operated to drive the generator during the welding operation, which places a substantial load on the generator at a speed of approximately 1,200 B. P. M., while it is desirable to have the motor merely idle at a relatively low speed of usually about 600 R. P. M. when the load on the generator is released. It is therefore necessary to provide a governor for the motor to prevent the same from racing under no load conditions and it has been found in practice that the usual weight operated centrifugal governor does not operate efficiently in controlling the motor so that when the same is idling and a load is applied to the generator, the motor will gain sufficient speed to operate the generator at the proper speed for the welding operation within a reasonable length of time. It has been found by actual practice that with a centrifugal governor as above mentioned, the motor will decrease in speed from the idling speed for a period of several minutes before it will begin gainin speed upon the application of a load to tie generator. As a result, it places the operator or welder at a substantial inconvenience in welding with an apparatus of this character in view of the fact that the operation of the welding tool at low speed of the generator produces undesirable results in the materials to be welded.

The present invention overcomes these difficulties and provides a substantially simple and quickly responsive mechanism to load and no load conditions on the generator.

The driving and driven disks 5 and 7 provide a direct driving connection between the crank shaft and the driven shaft fl, which have a limited rotative movement with respect to one another by the slotted structure of the driven disk by the slotted disk as above described. The driven disk is normally retained in the position illustrated in Fig. 2 due to the action of the coiled spring 20 in moving the body 17 toward the driven disk which forces the beveled end l-it of the rod 15 into the slots 11 and thru the cooperation of the beveled faces 13 and 14-, the body 17 will have a slight rotative movement with respect to the hub 6 of the driving disk so that the driven disk will be normally retained in the position shown in Fig. 2. In this position of the parts, the control 23 will operate the throttle lever 26 so that the throttle of the internal combustion engine will be moved to cut off the intake to the engine to such a point as to reduce the speed to a point as above described, so that the motor will not race under no load conditions.

With the mechanism operating in this manner, the use of the generator for welding which will immediately apply a load on the driven shaft 4 by throwin a substantial current from the generator tlirough the output circuit thereof will cause a substantially greater force to be applied to the driven disk 7 having a tendency to prevent its rotation with the disk 5 in the direction of the arrow in Fig. 3 as a result of which the disk 7 will rotate relative to the disk 5 so that the rod 15 will be forced outwardly from the recesses 11 to the position shown in Fig. 3. This operation takes place immediately upon the application of the load to the generator and the movement of the body 17,

effected by the operation of the disk 7 will operate the lever 23 and through the rod connection 25 will move the throttle 26 to a substantially open position, which will permit the application of greater power and the admission of more fuel to the motor as a result of which it will immediately increase speed to approximately the speed above described for the operation of the generator for welding purposes.

It will thus be seen that the driving connection between the motor and generator is directly through the disks 5 and 7 and the bolt connections 9 as well as the stud bolts 12, and in which the body 7 is movable axially on the shaft and hub 8 through the action of the spring 20, is not subjected to the driving strain and power transmitted between the motor and generator but is adapted for sufiicient longitudinal movement on the shaft to operate the lever 23 for the control purposes desired. It will also be understood that the sprin 20 is of such a character that the release of loads on the driven shaft 4 which allows the shaft to be substantially free of resistance of rotation with the disk 5 permits the spring 20 to move the disks from the position of Fig. 3 to the position shown in Fig. 2 wherein the same is retained under normal no load condition.

Having thus described my invention, what I claim as new is In a speed governing device of the class described, a pair of discs disposed in meeting contact, one disk being adapted to be mounted upon a driving shaft and the other disk being adapted to be mounted upon a driven shaft, said last named disk being provided with a plurality of elongated slots, the other disk being equipped with circumferentially spaced bolts, certain ones of which extend through complemental slots to provide a driving connection between the disks, said driving connections permitting relative cirtoward said disks, and projections carried cumferential movement of the disks, certain by said body and including beveled ends 'ofsaid bolts being provided with heads 10 engageable with the bevelled faces on said 1 cated in the remaining slots, said heads havheads. '5 ing bevelled faces, a body slidably mounted In testimony whereof I afiix my signature. upon'the driven shaft, a spring cooperating With said body 'to move it in a direction EDGAR F. BROWN. 

